We must have received the letter yesterday, but it didn’t arrive.

admin2011-07-28  30

问题 We must have received the letter yesterday, but it didn’t arrive.

选项

答案must——should

解析 must have done是肯定推测,但根据句意应当是“我们本该昨天就收到信,但至今仍没有收到”,故应当用should have done,表示“本应该”。
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